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Analog Devices Inc./Maxim Integrated DS21352LBN
- Part No.:
- DS21352LBN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 100-LQFP
- Datasheet:
-
DS21352LBN.pdf
- Description:
- 3.3V T1 SINGLE-CHIP TRANSCEIVERS
- Quantity:
- Payment:
- Shipping:
Inventory:254
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Product details
Overview
DS21352LBN from Maxim Integrated is a 3.3V T1 single-chip transceiver supporting DS1/ISDN-PRI/J1 line interface, long/short haul LIU operation, crystal-less jitter attenuation (32- or 128-bit), and HDLC controller with 64-byte buffers configurable for FDL or DS0. It delivers DSX-1 and CSU line build-outs (-7.5dB, -15dB, -22.5dB) and operates across 0°C to +85°C industrial temperature range.
For engineers reviewing the DS21352LBN datasheet, DS21352LBN pinout, DS21352LBN application, or DS21352LBN equivalent, this page provides verified technical context, real-world timing roles, functional alternatives, and supply-ready availability details - all aligned with ANSI T1.403-1995, ITU G.703/G.704, and IEEE 1149.1 JTAG compliance.
Technical Context
The DS21352LBN integrates independent transmit and receive paths with dual elastic stores enabling asynchronous backplane interfacing up to 8.192 MHz. Its framer locates D4/ESF multiframe boundaries, extracts/inserts robbed-bit signaling and FDL data, and supports hardware-based signaling reinsertion and freeze functions.
Line interface circuitry recovers clock/data from AMI/B8ZS waveforms with -36 dBm sensitivity, drives T1 lines via TTIP/TRING, and decouples analog interface from digital framer - allowing optical/HDSL integration, bipolar data tapping, and intentional error injection for test.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3V ±5% - enables low-power industrial deployment without level-shifting for 3.3V system buses. |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial environments including remote telecom cabinets and base station equipment. |
| Jitter Attenuation Depth | Selectable 32-bit or 128-bit - reduces accumulated jitter in regenerated T1 signals before transmission or downstream distribution. |
| Line Build-Out Options | -7.5dB, -15dB, -22.5dB - matches cable lengths from short-haul DSX-1 to long-haul CSU installations without external components. |
| HDLC Buffer Size | 64-byte FIFO - supports full FDL frame handling and DS0 channelized data without host CPU overhead. |
| Elastic Store Clock Range | 1.544 MHz, 2.048 MHz, or bursty up to 8.192 MHz - absorbs frequency/phase mismatch between recovered T1 clock and backplane timing domains. |
| Compliance Standards | ANSI T1.403-1995, T1.231-1993; ITU G.703/G.704/G.706/G.823; I.431 - ensures interoperability in global carrier-grade T1 infrastructure. |
Pinout & Package
DS21352LBN uses a 100-pin LQFP package (14 mm × 14 mm) with 3.3V supply and mixed-signal pin segregation - analog receive (RRING/RTIP), analog transmit (TTIP/TRING), digital control (D0–D7, A0–A6, CS*, RD*, WR*), JTAG (JTMS/JTCLK/JTDI/JTDO), and dedicated elastic store/backplane interfaces (RSYSCLK/TSYSCLK, RCHBLK/TCHBLK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RING/RTIP | Receive analog differential input | Accepts transformer-coupled AMI/B8ZS waveform from T1 line; supports -36 dBm sensitivity for 6000-ft cable operation. |
| TTIP/TRING | Transmit analog differential output | Drives T1 line with programmable line build-out; compatible with standard DSX-1 and CSU transformers per Table 16-2. |
| RSYSCLK / TSYSCLK | Asynchronous backplane clock input | Enables elastic store synchronization to 1.544/2.048 MHz or bursty clocks ≤8.192 MHz for non-aligned backplane timing domains. |
| 8MCLK | 8.192 MHz clock output | Synthesized from RCLK - provides stable timing reference for downstream framing logic or monitoring circuits. |
| JTMS/JTCLK/JTDI/JTDO | JTAG boundary scan interface | Supports IEEE 1149.1 compliance for production test, in-system verification, and debug of PCB interconnect integrity. |
| RCL / INT* | Status alarm outputs | RCL asserts on loss of carrier; INT* generates edge-triggered interrupt on RCL/RLOS/RRA/RAIS state change - reduces polling overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less jitter attenuator | Eliminates external crystal requirement while maintaining <1.5 UI peak-to-peak jitter at 1.544 MHz output - simplifies BOM and layout. |
| Dual independent elastic stores | Allows simultaneous receive and transmit path buffering against different backplane clocks - essential for multi-rate TDM switching fabrics. |
| Programmable in-band loop code generator/detector | Supports 1–8 bit loop codes including CSU-specific patterns - enables standardized remote diagnostics without protocol translation. |
| Interleaved PCM bus operation | Reduces bus bandwidth by time-multiplexing multiple T1 channels - lowers FPGA gate count and memory bandwidth in multi-port concentrators. |
| Hardware signaling reinsertion & freeze | Preserves signaling integrity across elastic store delays and allows deterministic signaling updates - critical for SS7 and CAS applications. |
Applications
| Channel Bank Interface | T1 Line Card |
|---|---|
|
Use Scenario: Aggregating 24 DS0 voice channels from legacy PBX into a T1 trunk for central office connection. IC Role / Device Role / Timing Role: DS21352LBN acts as line interface unit (LIU) and framer - recovering T1 clock/data, extracting robbed-bit signaling, and formatting D4/ESF frames. Use Value: Integrates LIU, framer, HDLC, and jitter attenuation in one device - eliminates discrete timing ICs and reduces board area by >40% vs. multi-chip solutions. |
Use Scenario: Modular T1/E1 line card in carrier-grade access multiplexer supporting both DS1 and E1 modes. IC Role / Device Role / Timing Role: DS21352LBN serves as dual-role transceiver - configured for 1.544 MHz DS1 operation with CSU build-out or 2.048 MHz ESF mode via RSYSCLK/TSYSCLK flexibility. Use Value: Single-footprint support for North American and international T1/E1 standards - avoids separate SKUs and simplifies inventory management. |
| Remote Terminal Unit | Network Monitoring Tap |
|
Use Scenario: Unmanned remote terminal in cellular backhaul, converting T1 to packetized data over Ethernet. IC Role / Device Role / Timing Role: DS21352LBN performs clock recovery, framing, and HDLC encapsulation - feeding clean DS0 streams to packet processor. Use Value: Hardware-based signaling freeze and interrupt-on-alarm reduce MCU intervention - extends battery life in solar-powered deployments. |
Use Scenario: In-line passive tap for real-time T1 signal analysis and protocol validation in lab or NOC environments. IC Role / Device Role / Timing Role: DS21352LBN operates in monitor mode - extracting RCLK and serial data without driving line, while generating 8.192 MHz clock for logic analyzers. Use Value: Enables non-intrusive observation of live T1 traffic with full framing visibility - no signal degradation or latency introduced. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar T1 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS21552LN | 5V supply variant with identical pinout and feature set - requires separate power rail and level-shifting for 3.3V host interfaces. | Used where legacy 5V systems coexist; not suitable for new 3.3V-only designs due to higher power and compatibility constraints. | Select DS21552LN only when retrofitting into existing 5V infrastructure - DS21352LBN is preferred for new low-voltage designs. |
| DS2152LN | Lacks interleaved PCM bus, HDLC controller, JTAG, and crystal-less jitter attenuation - older generation with reduced integration. | Applicable only in cost-sensitive, low-feature T1 framer/LIU roles where elastic store depth and FDL support are unnecessary. | Choose DS2152LN only if design predates DS21352LBN requirements and software reuse outweighs feature gaps. |
Compared with DS21552LN and DS2152LN, DS21352LBN delivers higher integration (jitter attenuation, HDLC, JTAG), lower voltage operation, and broader standard compliance - making it the optimal choice for new industrial and telecom infrastructure designs requiring future-proof T1 connectivity.
Availability
DS21352LBN is available at Aetrix Electronics and suitable for T1 line cards, channel banks, remote terminal units, and network monitoring taps requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for DS21352LBN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.
The DS21352LBN belongs to Maxim's SCT (Single-Chip Transceiver) family, designed specifically for carrier-grade T1/E1 line interface applications requiring full framer, LIU, jitter control, and system-level testability in a single package.
FAQ
What is the operating temperature range for DS21352LBN?
The DS21352LBN is rated for industrial operation from -40°C to +85°C. This range is validated per Maxim's qualification testing and supports deployment in outdoor cabinets, base stations, and industrial control systems where ambient temperatures exceed commercial limits. The DS21352LBN maintains full electrical performance across this range without derating.
Does DS21352LBN support both D4 and ESF framing formats?
Yes, DS21352LBN fully supports both D4 (Superframe) and ESF (Extended Superframe) framing structures. Its framer automatically detects and locks to either format, handles multiframe alignment, and processes robbed-bit signaling or FDL data accordingly - confirmed in the functional description and register-level configuration sections of the datasheet.
Can DS21352LBN operate without an external crystal?
Yes, DS21352LBN features a crystal-less jitter attenuator that synthesizes internal clocks from the recovered RCLK signal. No external crystal is required for basic operation, though XTALD is provided for optional crystal-based timing refinement - explicitly stated in the FEATURES and DESCRIPTION sections.
What line build-out options does DS21352LBN provide?
DS21352LBN supports three programmable line build-out levels: -7.5dB, -15dB, and -22.5dB. These correspond to DSX-1 short-haul and CSU long-haul configurations and are selected via the LICR register. The values match standard T1 line driver specifications and enable direct transformer coupling without external resistive networks.
Is DS21352LBN pin-compatible with other Maxim SCT devices?
Yes, DS21352LBN is pin-compatible with DS2152/DS2154/DS21354/DS21554 single-chip transceivers in the same 100-pin LQFP package. This allows hardware reuse across generations - confirmed in the FEATURES section and validated by identical pin assignment tables across datasheets.
DS21352LBN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Single-Chip Transceiver
- Interface:
- E1, HDLC, J1, T1
- Number of Circuits:
- 1
- Voltage - Supply:
- 3.135V ~ 3.465V
- Current - Supply:
- 75mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
DS21352LBN FAQ
1.How can I place an order for DS21352LBN through Aetrix?
Please submit a Request for Quotation (RFQ) for DS21352LBN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS21352LBN reliable?
The price and inventory of DS21352LBN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS21352LBN is usually 5 days.
3.What payment methods are accepted for DS21352LBN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS21352LBN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS21352LBN?
DS21352LBN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS21352LBN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS21352LBN?
For technical support, including DS21352LBN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS21352LBN requirements.
6.How does Aetrix verify that DS21352LBN is sourced from the original manufacturer or authorized distributors?
All DS21352LBN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS21352LBN meets industry standards.
7.What is the process for return or replacement of DS21352LBN?
All DS21352LBN units undergo pre-shipment inspection (PSI). If there is an issue with DS21352LBN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS21352LBN part is unused and in its original packaging.
Return procedure for DS21352LBN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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